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Published August 6, 2020 | Version 12.9.3
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geoschem/geos-chem: GEOS-Chem 12.9.3


GEOS-Chem 12.9.3 06 Aug 2020 DOI TBD

This release fixes some minor issues that were discovered after the release of 12.9.2.

  1. Fix to make HEMCO properly read vertical coordinates for data on arbitrary vertical grids
  2. Bug fix for planeflight diagnostic: Change parameter definition MAXAN=15 to MAXAN=20
  3. Fix additional typos in GEOS-Chem species database

Read the GEOS-Chem online manual at:

This release is compatible with GCHP. See the GCHP online manual for more information:

Learn how you can run GEOS-Chem on the Amazon Web Services cloud computing platform:


Please see the LICENSE.txt and AUTHORS.txt files in the root folder for the GEOS-Chem license description (based on the MIT license) and a complete list of authors. For more information about GEOS-Chem in general, please see and



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